re: BS170 Subcircuit

[Kris Pister]

>> We used a couple of BS170 transistors in our circuit, and discovered
that the XBS170 subcircuit in
>> ee105.mod (a) generates an error that causes hspice to abort when we
try to use it, (b) says it was
>> last modified 12/85, and (c) is commented as being for the BS170
from Zetex, which no longer
>> makes that part. The performance we're seeing in the lab from the
parts matches neither any
>> datasheet we can find nor spice simulations run after we attempted
to fix the XBS170 subcurcuit.

Anyone have a solution to this?

ksjp

[ale...@berkeley.edu]

The problem with the XBS170 subcircuit is that the values of w and l,
which are both 1, are too large. If you change them to smaller values,
hspice runs without aborting. I just changed both w and l to 1u instead
and my simulations matched up almost perfectly with my measured values.
Hope this helps.

Alex Sun